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P 1932- M. F. BURGETT METAL WORKER'S RAPID SPACER Filed NOV. 26, 1930Fig.3.

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i sions to Patented Sept. 13, 1932 UNITED STATES P TE T OFFICE MARION F.BURGETT, 0F INDIANAPOLIS, INDIANA METAL WORKERS RAPID SPACER Applicationfiled November 26, 1930. Serial No. 498,273.

as for example, locating the rivet points in flat piece of sheet metalof right dimenmake a cylinder or pipe-four inches in diameter so theholes in one section will register with those in the next when assembledtogether. The object also is to approsriately stamp the device with aseries of pipe diameters and corresponding sheet lengths.

I accomplish the above and other objects which will hereinafter appear,by the device illustrated in the accompanying drawing, in which 1 is atop plan view of my invention in nearly folded condition;

Fig. 2 shows the device applied for use in marking off the rivet holesin a sheet of material cut to dimensions for afour inch pipe;

and

Fig. 3 shows the .same sheet after the places for the rivet holes aremarked thereon by the use of my invention.

Like characters of reference indicate like parts in the several views ofthe drawing.

The body or frame of my device comprises a series of top bars, hereshown as fourteen in number, the two'end ones of which are substantiallyone half of the length of those between. It also comprises a like numberof bottom bars. The long top bars cross the long bottom bars at theirends and middles and are pivotally united in pairs, at their middles, byrivets a. The inner ends of the top short bars are pivotally united tothe adjacent ends of the short bottom bars. The outer ends of the bottomshort bars are pivotally united by rivets b with the outer ends of theirrespective nearest long top bars, and the outer ends of the next longtop bars are likewise pivotally connected with the ends of the nextbottom long bars and so on until both ends of all of the long bars arepivotally connected with the corresponding ends of the correspondinglong bottom bars, making a lazy tongs structure.

The rivets in the ends of the bars are all the same distance from themiddle rivets of their respective bars. The top bars are permanentlynumbered consecutively from 0 to 12, beginning with the first long bar.These numbers indicate the diameters in inches of round pipes which canbe made from a sheet of a length in inches which is stamped on the samebar. For example, a 4 nch pipe will require a sheet 12% inches long whenthe edges are to be contacted and edge-welded. The numbers on the barsgive the net dimensions without any allowance for laps or seams, to suchdegree of accuracy as is'required by sheet metal workers who use acommon rule and not a decimal or-finely graduated scale. When lap orlock seams are to be made the trade skill of the workmen will enable himto add the corresponding additional measurements.

If desired, the bars may be numbered on both ends.

Holes 0 are punched through the midwidth of the bars and midway betweentheir ends and middle pivots to aid in marking surfaces.

The dimensions of the bars in length, width and thickness, will bevaried to suit the size of the work to be spaced, and the number of barsmay also be varied for the same reason.

In the example shown in Figs. 2 and 3, o

it is desired to lay off a flat metal sheet 03 of right length to make apipe four inches in diameter and to mark the points for holes for rivetsto unite this section with other similar sections. The workman byreference to bar marked 4", which is the desired pipe diameter, isinformed by the number 12 also marked on that bar, of the length ofsheet required to make a 4; inch pipe, and he lays out and cuts off themetal sheet (Z accordingly. Then he draws a line e--f parallel with oneof the long edges of the sheet, at a distance from that edge equal tothe distance therefrom of the centers of the desired holes.

My spacing device is then expanded and laid upon the sheet d, with theright edge of bars 0 and 4 at the respective ends of the line e;. As acheck the ends of the sheet should be visible through and bisect theholes 0 in the bars 0 and 4. Then the locations of the rivet holes allalong the line ef, are marked by drawing cross lines, using the rightedges of bars 1, 2 and 3 as stralght edges. Upon removal of the spacingdevice the sheet 5 (Z will appear as shown in Fig. 3 wherein thelocation 01" the rivet holes will be designated at the crossing of line6f by the short diagonal lines.

Having thus fully described my invention 10 and its manner of use, whatI claim as new and wish to secure by Letters Patent, is

1. In a device for laying ofi equal spaces, a plurality of upper andlowerbars, the upper bars crossing the lower bars at their ends 15 andmiddles, pivotal connections between the bars at their crossing placesin the manner of a lazy tongs structure, each of said top bars beingformed with numbers increasing 1 consecutively in value frombar to bardes- 250 ignating pipe diameters and all of said bars being formed withsight holes through their midwidths midway between their end and middlepivots.

2. In a device for laying off equal spaces,

2 a plurality of upper and lower bars, the upper bars crossing the lowerbars at their ends and middles, pivotal connections between the bars attheir crossing places in the manner of a lazy tongs structure, each ofsaid top bars 0 being formed with numbers increasing consecutively invalue from bar "to bar, said numbers designating pipe diameters andhaving circumference measurements for each diameter on the respectivebars and all of 35 said bars having sight holes through their midwidthsmidway between their end and middle pivots.

In testimony whereof I alliX my signature.

MARION F. BURGETT.

